Physical Testing 物理测试
DIN EN 12056-3 demands:

In Siphonic systems, the design method shall be validated by physical testing.

Requirements for the physical test:

Dimensioning of the pipework with a special Simulation Calculation (also called Iteration Calculation)

Zeta value of the drain according to DIN EN 1253-1 / DIN EN 1253-2 has to be used at the calculation.
DIN EN 12056-3要求:

在虹吸式系统里,设计方法需要经过物理测试的验证。

物理测试要求:

运用专门模拟计算(也被称为迭代计算)对管道进行度量。

计算过程中使用根据DIN EN 1253-1 / DIN EN 1253-2确定的管道Zeta值。
This information is based on German laws, standard, and regulations (rules). We shall give no guaratee that the information is suitable for use in other countries or that it is in accordance with the rules in place there. Nevertheless, we are unable to guarantee the correcrness, completeness and up-to-dateness of the information and therefore exclude any liability in this respect. Subject to change without notice. © Keidel GmbH 2012. All rights reserved.